oj.uz

답안 #830113

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
830113 2023-08-18T19:01:25 Z MohamedAhmed04 Designated Cities (JOI19_designated_cities) C++14
6 / 100
 2000 ms 49316 KB 
#include <bits/stdc++.h>
 
using namespace std ;
 
const int MAX = 2e5 + 10 ;
 
int arr[MAX] ;
int n , q ;
 
vector< vector< pair<int , int> > >adj(MAX) ;
 
long long ans[MAX] ;
 
int mark[MAX] ;
int sz[MAX] ;
int cursrc , cursz ;
long long curcost ;
 
pair<long long , int>tree[4 * MAX] ;
long long lazy[4 * MAX] ;
 
void build(int node , int l , int r)
{
	if(l == r)
	{
		tree[node] = {0 , l} , lazy[node] = 0 ;
		return ;
	}
	int mid = (l + r) >> 1 ;
	build(node << 1 , l , mid) ;
	build(node << 1 | 1 , mid+1 , r) ;
	tree[node] = max(tree[node << 1] , tree[node << 1 | 1]) ;
}
 
void prop(int node , int l , int r)
{
	tree[node].first += lazy[node] ;
	if(l != r)
	{
		lazy[node << 1] += lazy[node] ;
		lazy[node << 1 | 1] += lazy[node] ;
	}
	lazy[node] = 0 ;
}
 
void update(int node , int l , int r , int from , int to , int val)
{
	if(lazy[node])
		prop(node , l , r) ;
	if(from > r || to < l || from > to)
		return ;
	if(l >= from && r <= to)
	{
		lazy[node] += val ;
      	prop(node , l , r) ;
		return ;
	}
	int mid = (l + r) >> 1 ;
	update(node << 1 , l , mid , from , to , val) ;
	update(node << 1 | 1 , mid+1 , r , from , to , val) ;
	tree[node] = max(tree[node << 1] , tree[node << 1 | 1]) ;
}
 
pair<long long , int>query(int node , int l , int r , int from , int to)
{
	if(lazy[node])
		prop(node , l , r) ;
	if(from > r || to < l || from > to)
		return {-1e18 , -1e9} ;
	if(l >= from && r <= to)
		return tree[node] ;
	int mid = (l + r) >> 1 ;
	pair<long long , int>a = query(node << 1 , l , mid , from , to) ;
	pair<long long , int>b = query(node << 1 | 1 , mid+1 , r , from , to) ;
	return max(a , b) ;
}
 
void dfs_pre(int node , int par)
{
	sz[node] = 1 ;
	for(auto &childd : adj[node])
	{
		int child = childd.first ;
		if(child == par || mark[child])
			continue ;
		dfs_pre(child , node) ;
		sz[node] += sz[child] ;
	}
}
 
int FindCentroid(int node , int par)
{
	for(auto &childd : adj[node])
	{
		int child = childd.first ;
		if(child == par || mark[child])
			continue ;
		if(sz[child] > cursz / 2)
			return FindCentroid(child , node) ;
	}
	return node ;
}
 
int val[MAX] ;
int in[MAX] , out[MAX] , id[MAX] ;
int tim = 0 ;
int sub[MAX] , P[MAX] , erased[MAX] , edgcost[MAX] ;
long long sum[MAX] , Max[MAX] ;
 
void dfs(int node , int par)
{
	in[node] = ++tim , id[tim] = node , P[node] = par ;
	curcost += val[node] , erased[node] = 0 ;
	sum[node] = Max[node] = val[node] ;
	for(auto &childd : adj[node])
	{
		int child = childd.first , w = childd.second ;
		if(child == par)
			edgcost[node] = w ;
		if(child == par || mark[child])
			continue ;
		val[child] = w ;
		if(in[node] == 1) //centroid
			sub[child] = child ;
		else
			sub[child] = sub[node] ;
		dfs(child , node) ;
		sum[node] += sum[child] ;
		Max[node] = max(Max[node] , Max[child] + val[node]) ;
	}
	out[node] = tim ;
	update(1 , 1 , cursz , in[node] , out[node] , val[node]) ;
}
 
void Erase(int node)
{
	while((!erased[node]) && node)
	{
		erased[node] = 1 ;
		update(1 , 1 , cursz , in[node] , out[node] , -1 * val[node]) ;
		node = P[node] ;
	}
}
 
void solve(int src , long long cost)
{
	tim = 0 ;
	cursrc = src , curcost = cost ;
	dfs_pre(src , 0) ;
	cursz = sz[src] ;
	int centroid = FindCentroid(src , -1) ;
	val[centroid] = 0 ;
	build(1 , 1 , cursz) ;
	dfs(centroid , 0) ;
	ans[1] = min(ans[1] , curcost) ;
	long long Max1 = 0 , Max2 = 0 ;
	for(auto &childd : adj[centroid])
	{
		int child = childd.first , w = childd.second ;
		if(mark[child])
			continue ;
		if(Max[child] > Max1)
			Max2 = Max1 , Max1 = Max[child] ;
		else if(Max[child] > Max2)
			Max2 = Max[child] ;
	}
	bool flag = true ;
	int prv ;
	for(int i = 1 ; i <= cursz ; ++i)
	{
		pair<long long , int>p = query(1 , 1 , cursz , 1 , cursz) ;
		if((!p.first))
		{
			ans[i] = min({ans[i] , curcost , ans[i-1]}) ;
			break ;
		}
		int node = id[p.second] ;
		if(i > 1)
			flag &= (sub[node] == sub[prv]) ;
		curcost -= p.first , Erase(node) ;
		if(!flag)
			ans[i] = min(ans[i] , curcost) ;
		else if(i > 1)
			ans[i] = min(ans[i] , curcost + p.first - Max2) ;
		prv = node ;
	}
	mark[centroid] = 1 ;
	for(auto &childd : adj[centroid])
	{
		int child = childd.first , w = childd.second ;
		if(mark[child])
			continue ;
		solve(child , cost + sum[centroid] - sum[child] + edgcost[child]) ;
	}
}
 
int main()
{
	ios_base::sync_with_stdio(0) ;
	cin.tie(0) ;
	cin>>n ;
	for(int i = 0 ; i < n-1 ; ++i)
	{
		int x , y , c , d ;
		cin>>x>>y>>c>>d ;
		adj[x].emplace_back(y , c) ;
		adj[y].emplace_back(x , d) ;
	}
	for(int i = 0 ; i <= n ; ++i)
		ans[i] = 1e18 ;
	solve(1 , 0) ;
	for(int i = 1 ; i <= n ; ++i)
		ans[i] = min(ans[i] , ans[i-1]) ;
	cin>>q ;
	while(q--)
	{
		int x ;
		cin>>x ;
		cout<<ans[x]<<"\n" ;
	} 
	return 0 ;
}

Compilation message

designated_cities.cpp: In function 'void solve(int, long long int)':
designated_cities.cpp:159:30: warning: unused variable 'w' [-Wunused-variable]
  159 |   int child = childd.first , w = childd.second ;
      |                              ^
designated_cities.cpp:190:30: warning: unused variable 'w' [-Wunused-variable]
  190 |   int child = childd.first , w = childd.second ;
      |                              ^

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 2 ms 5076 KB Output is correct
3 Correct 2 ms 5080 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 2 ms 5096 KB Output is correct
10 Correct 2 ms 5104 KB Output is correct
11 Correct 2 ms 5076 KB Output is correct

Subtask #2
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Correct 1122 ms 37088 KB Output is correct
3 Correct 1733 ms 48860 KB Output is correct
4 Correct 1503 ms 37180 KB Output is correct
5 Correct 427 ms 37120 KB Output is correct
6 Correct 1532 ms 38796 KB Output is correct
7 Correct 388 ms 37084 KB Output is correct
8 Execution timed out 2067 ms 49316 KB Time limit exceeded
9 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Incorrect 1193 ms 37160 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 2 ms 5076 KB Output is correct
3 Correct 2 ms 5080 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 2 ms 5096 KB Output is correct
10 Correct 2 ms 5104 KB Output is correct
11 Correct 2 ms 5076 KB Output is correct
12 Correct 2 ms 5076 KB Output is correct
13 Incorrect 7 ms 5412 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Correct 1122 ms 37088 KB Output is correct
3 Correct 1733 ms 48860 KB Output is correct
4 Correct 1503 ms 37180 KB Output is correct
5 Correct 427 ms 37120 KB Output is correct
6 Correct 1532 ms 38796 KB Output is correct
7 Correct 388 ms 37084 KB Output is correct
8 Execution timed out 2067 ms 49316 KB Time limit exceeded
9 Halted 0 ms 0 KB -

Subtask #6
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 2 ms 5076 KB Output is correct
3 Correct 2 ms 5080 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 2 ms 5076 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 2 ms 5096 KB Output is correct
10 Correct 2 ms 5104 KB Output is correct
11 Correct 2 ms 5076 KB Output is correct
12 Correct 2 ms 5076 KB Output is correct
13 Correct 1122 ms 37088 KB Output is correct
14 Correct 1733 ms 48860 KB Output is correct
15 Correct 1503 ms 37180 KB Output is correct
16 Correct 427 ms 37120 KB Output is correct
17 Correct 1532 ms 38796 KB Output is correct
18 Correct 388 ms 37084 KB Output is correct
19 Execution timed out 2067 ms 49316 KB Time limit exceeded
20 Halted 0 ms 0 KB -